feat: add full Zonemaster stack with Docker and Spanish UI

- Clone all 5 Zonemaster component repos (LDNS, Engine, CLI, Backend, GUI)
- Dockerfile.backend: 8-stage multi-stage build LDNS→Engine→CLI→Backend
- Dockerfile.gui: Astro static build served via nginx
- docker-compose.yml: backend (internal) + frontend (port 5353)
- nginx.conf: root redirects to /es/, /api/ proxied to backend
- zonemaster-gui/config.ts: defaultLanguage set to 'es' (Spanish)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

zonemaster-backend/share/zm_rpcapi-bsd

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# PROVIDE: zm_rpcapi
+# REQUIRE: NETWORKING mysql postgresql
+# KEYWORD: shutdown
+
+. /etc/rc.subr
+
+name="zm_rpcapi"
+rcvar="${name}_enable"
+
+load_rc_config $name
+: ${zm_rpcapi_enable="NO"}
+: ${zm_rpcapi_user="zonemaster"}
+: ${zm_rpcapi_group="zonemaster"}
+: ${zm_rpcapi_pidfile="/var/run/zonemaster/${name}.pid"}
+: ${zm_rpcapi_logfile="/var/log/zonemaster/${name}.log"}
+: ${zm_rpcapi_listen="127.0.0.1:5000"}
+
+export ZONEMASTER_BACKEND_CONFIG_FILE="/usr/local/etc/zonemaster/backend_config.ini"
+#export ZM_BACKEND_RPCAPI_LOGLEVEL='warning'  # Set this variable to override the default log level
+
+command="/usr/local/bin/starman"
+command_args="--listen=${zm_rpcapi_listen} --preload-app --user=${zm_rpcapi_user} --group=${zm_rpcapi_group} --pid=${zm_rpcapi_pidfile} --error-log=${zm_rpcapi_logfile} --daemonize /usr/local/bin/zonemaster_backend_rpcapi.psgi"
+pidfile="${zm_rpcapi_pidfile}"
+required_files="/usr/local/etc/zonemaster/backend_config.ini /usr/local/bin/zonemaster_backend_rpcapi.psgi"
+
+run_rc_command "$1"